Autumnfade, interesting fact I did not know. I figured that since it was a 77 and an EM it had to be one of the very last EM's made in any number from really any manufacturer? I may be wrong on that though, but I know Williams was switched over to SS by this point so I assume Gottlieb was not to far behind. Anyways back to sonics, I love the mars trek of course for a popular sonic but I am really interested in a prospector or a faces as you mention. That "faces" is just so out there with the art you gotta love it.
it is weird I have come across 2 sonics (super strait and now this cherry bell) in 4 months time. Both cost me the same price ($140) and are wonderful EM's. The playfield durability on these is the best in the industry of the period bar none. Even the super straight which was more worn and played than this mint cherry bell was still near perfect on the playfield surface.
Crappy cabs though, good art but poor "wood" choice. It is cheap ass particle board or whatever the european standard for particle board was back then. It sucks, and is fragile as hell. Shame because they put good art on the sides, that's why I love that cherry bell so much, not only the playfield nice (common for a sonic) but the cab is cherry (rare for a sonic). If you are ever in Colorado a.f. you are welcome to stop by and play it and talk shop.
regards